[Linuxptp-users] shortly following DELAY_REQ from two slaves only trigger one DELAY_RESP (Intel 82579LM)

[Hanspeter P. <de...@op...>]

I have my time master (e1000e, Intel 82579LM) set up with hardware time
stamping.
Then I have two slaves set up with software timestamping (not using
linuxptp, microcontrollers).

When the two slaves send their delay requests shortly following each
other, often only one of both is answered.
For the ignored one, there is this error: 'ptp4l[16004.338]: port 1:
received DELAY_REQ without timestamp'

For the ignored delay request:
- 'fsm_event_port_event' returns -ETIME
- because 'transport_recv' reports a hardware time stamp of 0
- 'transport_recv' calls 'udp_rec' which calls 'sk_receive'
- there I've seen that the ignored delay request packet has no cmsg and
therefore no associated timestamp

Has anybody encountered similar issues?

Here the corresonding wireshark capture:
https://dl.dropboxusercontent.com/u/46882396/ptp4l.pcapng.gz

Hanspeter